Ordinarily, eight mana is far too expensive for Goblin decks, but City on Fire has convoke, a good use for all those Goblin tokens
The Green sorcery costs three and is a Cultivate with a double Green cost
4 Nahiri, Forged In Fury 215 (Halo Foil) - $24.90 Stuck back on her home plane of Zendikar, Nahiri, Forged in Fury is perhaps one of the most exciting new legendary creatures from The Aftermath
You can see that I took one mechanic, learned how to use it, and then tried to build a second deck around the same thing
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Or you can use Ashnod's Altar and Phyrexian Altar to create a loop where Prossh makes tokens, then you sac him (and a few tokens) to the altars to generate enough mana to recast your commander, thus making even more tokens
